Rennen chainring, 4 bolt (104) - black

Rennen Decimal Gearing is a breakthrough in gearing technology. They have developed Special Engineered Tooth profiles that allow us to manipulate the size of an exisiting gearing to make it slightly harder or easier depending on your needs for the track. Changing your gearing by Fractions of a tooth is now possible.

Now you have the abilty to go down .1T, .2T or .3TOr go Up by .1T or .2T (Ex. 43.7T, 44.2T)